hello guys i have 64-bit (multilib) and i have used mplayer with a native64 flash.i didnt find the howto
(it was a year ago)but it was easy if you have conqueror.just install mplayer and its flash
start conqeror go to settings config.. conqueror , file associations , +video and set it on show file in embedded viewer
the thing is that i use mozilla to .but this was what i had to do

I have the exact same thing on ~AMD64. I tried different versions of Firefox and Flash together, but that didn't change a thing. A clean user experienced the same thing. Using a clean profile folder isn't the solution either.

It looks like Firefox just forgets where adobe-flash is residing on the system. A re-emerge tells it where it is again, but after a while Firefox just doesn't remember anymore ---> re-emerge again.

There was a bug-report on this issue but they removed it, not sure what reason that was for. It's annoying me. Flash works, but having to re-emerge again and again just sucks._________________It doesn't matter what's right, it's only wrong if you get caught.

I'm going to install the version from the Adobe site and see if the same problem occurs. There should be no difference between the two but you never know._________________It doesn't matter what's right, it's only wrong if you get caught.

click on "disable" on that list, close firefox, restart, close firefox (see that it's really closed in ksysguard, gnome-system-monitor, top, etc.), start and re-enable it whether that allows you to play flash-content again

I had the same problem.
It turned out that when I moved from my old 32bit install I also moved the ~/.mozilla directory (since it's part of my home directory). I found that there was a 32 bit version of a flash plugin in ~/.mozilla/plugins as well as a pluginreg.dat in ~/.mozilla (containing the plugin info). I removed the plugin driectory and the file and it's working fine now. Not sure how it got there but this worked for me.
Maybe you want to check if you have a local 32 bit version as well.
ciao
Joe

Hmm I wonder how I overlooked the ~/.mozilla plugin directory....there was indeed a plugin there, but I'm not sure whether it was the 32bits or 64bits version. The problem still existed. I even tried removing the gentoo flash plugin and installing the 64bits plugin from Adobe Labs to no avail.
I converted my system from 32bits to 64bits some time ago, but kept /home as it was. I never thought about the flashplugin since portage doesn't install it there. I've removed the local plugin now and see if this solves the problem.

Great tip, hope it works _________________It doesn't matter what's right, it's only wrong if you get caught.

I found that installing nspluginwrapper has allowed me to run 32-bit plugins in my 64-bit browser. Portage warns of stability and security issues with Adobe Flash 10.1, but I'm willing to chance it for now.